I was playing around with the D800 yesterday morning using a Nikkor 60mm Micro lens on a tripod with remote shutter button. The subject was a fern taken about 6 inches away on auto focus.
First, I tried it with the mirror up and then used the remote on the tripod.
Next, I did a normal shot with the mirror down and the remote.
Then I pressed the shutter on the camera with the mirror up.
Finally, I pressed the shutter on the camera as carefully as I could with the mirror down.
As would be expected, the clearest image was when the mirror was up, on the tripod, with a remote shutter switch.
Everything else caused the 'double effect', which was only noticeable when magnifying at 100% or more after importing into PP software.
This camera really emphasizes my poor hand holding technique. I either need to practice and change how I shoot, or carry a tripod wherever I go. This is an incredible camera, and I hope to someday to able to utilize its power.